CN101242657B - Method and apparatus for supporting application-layer media multicasting - Google Patents

Method and apparatus for supporting application-layer media multicasting Download PDF

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Publication number
CN101242657B
CN101242657B CN200810009797.6A CN200810009797A CN101242657B CN 101242657 B CN101242657 B CN 101242657B CN 200810009797 A CN200810009797 A CN 200810009797A CN 101242657 B CN101242657 B CN 101242657B
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China
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group
media
described
communication device
target communication
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CN200810009797.6A
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Chinese (zh)
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CN101242657A (en
Inventor
A·M·陈
E·C·罗森
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高通股份有限公司
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Priority to US10/142,369 priority patent/US7035657B2/en
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Priority to CN03816187.7 priority
Publication of CN101242657A publication Critical patent/CN101242657A/en
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Publication of CN101242657B publication Critical patent/CN101242657B/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18Service support devices; Network management devices
    • H04W88/182Network node acting on behalf of an other network entity, e.g. proxy
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1836Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with heterogeneous network architecture
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08User group management

Abstract

The invention relates to method and device supporting multicasting media of application layer, in particular method and device transmitting the media to a group of target communication devices. The method regulates that multicasting media to the group of target communication devices to save network resources. The disclosed embodiments provide for a significant reduction in network traffic and media processing time by transmitting media in multicast transport mode, where a single copy of the media destined for a group of target recipients is transmitted to a wireless infrastructure over the multicast path. The wireless infrastructure replicates and transmits one copy of the media to each of the target recipients that are assigned to dedicated channels, but multicasts one copy of the media to the target recipients that are assigned to a shared channel.

Description

For supporting the method and apparatus of application-layer media multicasting

The application be the applying date be on May 6th, 2003 application number be dividing an application of No. 03816187.7 denomination of invention Chinese patent application that is " for supporting the method and apparatus of application-layer media multicasting ".

Technical field

The present invention relates to point-to-multipoint communication system, relate in particular to for supporting the method and apparatus of application layer multicast, described application layer multicast is for being sent to one group of target communication device in wireless communication networks Media Stream.

Background technology

In group call service, organize in a large number participant and be conventionally gathered in little geographic area, for example construction site.For this group of participant sets up point-to-point communication link, be infeasible, this group of participant can be positioned at single sector.The group participant meeting all resources that this sector can be used that " arch upward ".The very high calling prevention rate that this can cause other user to stand.In addition,, if group participant's density is very high in given sector, network may not have enough resources to each group participant assigned with dedicated channel.Therefore, user to be rejected that access group calls out be not owing to having group membership problem but owing to lacking available Internet resources.This problem has a negative impact to group calling party.

Existing group calling is requiring group calling only to send a copy server replicates media and on independent point-to-point communication link to each group participant.Making group calling is a task that processor is intensive server replicates media for sending to all participants of target group, and for server, is heavy when group participant quantity is very large.Make to organize the copy that call server sends media to each group participant and improved the network traffic on the Radio Access Network (RAN) of radio infrastructure and these two networks of service provider's wide area network (WAN).

For example, a class wireless service is for fast, effectively, one to one or the communication of one-to-many (group).Conventionally, these services are semiduplex, wherein user press " push-to-talk " in phone/radio (PTT) button start a group calling.If licensed right to speak, speaker generally can say several seconds.Speaker, discharge after PTT button, other group membership just can ask right to speak.These services are used in such application traditionally: one of them people, i.e. " dispatcher ", need to communicate by letter with lineup (such as on-site service personnel or taxi driver), " scheduling " title source part of service that Here it is.Similar service is being provided on internet, and they are called " voice-enabled chat ".

Therefore, need some mechanism for preserving Radio Resource, reducing the processing load of server and the network traffic that reduces the RAN of radio infrastructure and service provider's WAN.

Summary of the invention

The disclosed embodiments provide for media being sent to novelty and the improved method and apparatus of one group of target communication device, and its media multicast mechanism by application layer is preserved Internet resources.On the one hand, a kind of method and apparatus is for multicasting media to one group of target communication device in wireless communication networks, and described wireless communication networks comprises radio infrastructure and group call server (GCS).The method is multicasted to radio infrastructure by a copy of media from GCS, for sending to described one group of target communication device.The method is each more than first target communication device in radio infrastructure sends to the first community or sector by a copy of media also, and a copy of media is multicasted to more than second target communication device in the second community or sector from radio infrastructure.

On the one hand, a kind of counting that comprises the participant who determines described this group target communication device for determine whether to multicast media to the method and apparatus of one group of target communication device on multicast path, if and determined counting exceeds a predetermined threshold, multicast media to radio infrastructure, for being sent to described this group target communication device.

On the one hand, a kind ofly for information being sent to the device of one group of target communication device of wireless communication system, comprise: memory cell, receiver, transmitter and the processor that communication is upper and memory cell, Receiver And Transmitter are coupled.Processor can be realized above-mentioned method.

Accompanying drawing explanation

By the detailed description with the accompanying drawing proposing below, it is more obvious that feature of the present invention, character and advantage will become, and in accompanying drawing, identical element has identical sign, wherein:

Fig. 1 has illustrated a group communication system;

Fig. 2 has illustrated the embodiment of base station and mobile radio station in Fig. 1;

Fig. 3 has illustrated how several communication equipments interact with one group of call server;

Fig. 4 has illustrated an embodiment of the group call server being operated in Fig. 1;

Fig. 5 has illustrated according to the call establishment of the first embodiment; And

Fig. 6 has illustrated according to the call establishment of the second embodiment.

Embodiment

Describing in detail before several embodiment, should be appreciated that the invention is not restricted to it following describe or accompanying drawing in the component structure that proposes and the application in layout details.The present invention can realize and accomplished in various ways in other embodiments.Should be appreciated that equally, word used herein and term are in order to describe object, should not be considered to be restrictive.

Fig. 1 has illustrated according to the functional block diagram of the group communication system of an embodiment 100.Group communication system 100 is also referred to as push-to-talk (PTT) system, internet broadcast service (NBS), dispatching patcher or point-to-multipoint communication system.In one embodiment, group communication system 100 comprises one group of call server 102, it can be deployed in central authoritiesization layout or regionalization layout, as the patent application of awaiting the reply of submitting to February in 2002 14: U.S. Patent Application Serial Number 10/076, in 726, describe, this application is transferred to assignee of the present invention and is incorporated into by reference this completely.

Group communication equipment 104 can be deployed as the cdma2000 family such as mobile phone, and for example, group communication equipment 104 can usage data service option request grouping data conversation.Each communication equipment can use session to the IP address of group call server 102 registered communications devices to carry out group calling starting.In one embodiment, communication equipment 104, from radio infrastructure request grouping data conversation, can be had to the IP of group call server 102 and be connected with Internet protocol (IP) network 108 by PDSN 106.Between the transfer of data of PDSN in fixed network and aerial transfer of data, provide interface.Each PDSN can join by Packet Control Function piece (PCF) 112 and base station controller (BSC) 110, and PCF112 can be positioned at and exist together with BSC.

After powering up, CD104 can usage data service option request grouping data conversation.As a part of setting up grouping data conversation, each CD can be assigned to an IP address.Each CD can carry out registration process and notify the IP address of GCS 102 about CD.Registration can be carried out by IP agreement, such as the session initiation protocol in User Datagram Protoco (UDP) (UDP).The IP address of CD be used in invite corresponding user enter group calling time contact CD.Once having set up group calling just can switched-media and signaling message, CD 104 and GCS 102.In one embodiment, media can be used the real-time protocol (RTP) (RTP) on UDP calling out transmission between participant and GCS 102.Signaling message can be also the signaling protocol on UDP.

Group communication system 100 is carried out several different functions so that operational group service.About the function of user side comprise that user registers, group calling starting, group calling stopping, to group membership send warnings, evening add group calling, speaker's arbitration, to group increase user, from organizing removing members, cancelling member and authentication.Function about system preparation and operation comprises management, supply, scalability and reliability.These functions are described in detail in above-mentioned 10/076, No. 726 application.

Fig. 2 is the simplified block diagram of the embodiment of base station 204 and mobile radio station 206, and base station 204 and mobile radio station 206 can be realized various disclosed embodiment.For specific communication, can be via air interface 208 exchanges voice data, grouped data and/or message between base station 204 and mobile radio station 206.Can send various types of messages, such as for setting up message, registration and the beep-page message of communication session and for example, for the message of control data transmission (power control, data-rate information, confirmation etc.) between base station and mobile radio station.Some of these type of messages are discussed in more detail below.

For reverse link, at mobile radio station 206 places, voice and/or grouped data (for example, from data source 210) are offered to transmission (TX) data processor 212, and the latter formats and encodes to produce coded data by one or more encoding schemes for data and message.Each encoding scheme can comprise any combination of cyclic redundancy check (CRC) (CRC) code, convolution code, turbo code, block code and other yard, or does not encode.Speech data, grouped data and message can be encoded by different schemes, and dissimilar message is carried out to different codings.

Then coded data is offered to modulator (MOD) 214 and further process (for example cover, by short PN sequence extension and with the long PN sequence scrambler of distributing to user terminal).Then modulated data is offered to transmitter unit (TMTR) 216 and regulates (for example converting one or more analog signals, amplification, list and quadrature modulation to) to produce reverse link signal.Reverse link signal is routed by antenna multicoupler (D) 218 and is sent to base station 204 via antenna 220.

204 places in base station, reverse link signal is received, is routed by antenna multicoupler 252 and is provided for receiver unit (RCVR) 254 by antenna 250.Base station 204 can receive log-on message and state information from mobile radio station 206, such as mobile radio station rate travel.Receiver unit 254 regulates (for example filtering, amplification, down-conversion and digitlization) receive signal and sampling is provided.Demodulator (DEMOD) 256 receives and processes (for example de-spread, solution cover and pilot demodulated) sampling so that the code element through recovering to be provided.Demodulator 256 can be realized a thunder gram receiver, and this thunder gram receiver is processed and received the Multi-instance of signal and produce combined symbols.Then, receive 258 pairs of symbol decodings of (RX) data processor so that data and the message of recovering to send on reverse link.Voice/packet data through recovering is provided for data sink 260, and the message through recovering is provided for controller 270.Controller 270 can comprise instruction, for: one group of mobile radio station of paging, send radio parameter and mobile radio station is tied to multicast group to mobile radio station.The processing of demodulator 256 and RX data processor 258 is contrary with the processing that mobile radio station 206 places carry out.Demodulator 256 and RX data processor 258 can be further used for a plurality of transmission that receive via many channels, and described many channels are Reverse Fundamental Channel (R-FCH) and reverse supplemental (R-SCH) for example.Equally, transmission can be simultaneously from a plurality of mobile radio stations, and each mobile radio station sends on Reverse Fundamental Channel, reverse supplemental or this two channels.

On the forward link, 204 places in base station, voice and/or grouped data (for example, from data source 262) and message (for example carrying out self-controller 270) are processed (for example format and encode) by sending (TX) data processor 264, further by modulator (MOD) 266, process (for example cover and expand) and regulate (for example converting analog signal, amplification, filtering and quadrature modulation to) by transmitter unit (TMTR) 268, to produce forward link signal.Forward link signal is routed by antenna multicoupler 252, and is sent to mobile radio station 206 via antenna 250.Forward link signal comprises paging signal.

At mobile radio station 206 places, forward link signal is received, is routed by antenna multicoupler 218 and is provided for receiver unit 222 by antenna 220.Receiver unit 222 regulates (for example down-conversion, ratio, amplification, quadrature modulation and digitlization) receive signal and sampling is provided.Sampling is processed (for example de-spread, solution cover and pilot demodulated) so that code element to be provided by demodulator 224, receives data processor 226 and further processes data and the message of (for example decoding and verification) described code element to recover to send on forward link.Data through recovering are provided for data sink 228, and the message through recovering is provided for controller 230.Controller 230 can comprise instruction, for: registration mobile radio station 206, request group calling and media are sent to base station 204.

Group call service (GCS) can allow a user to speak to one group of user with semiduplex mode or full-duplex mode.Under former instance, owing to once only allowing a people to speak, the license of therefore speaking may be relaxed by infrastructure.In this system, user can ask the license of speaking by for example pressing " push-to-talk " button (PTT).System can be arbitrated the request receiving from a plurality of users, and by competing a solution process, system can be selected a requestor according to predetermined algorithm.Then, system can be notified this user of user of choosing licensed speaking.System, user's traffic information, such as voice and/or data, is distributed to group membership's the rest from the speaker who authorizes, the rest is regarded as " listener ".Voice in GCS and/or data traffic can be different from traditional call one to one, need to arrange priority in some session.

Fig. 3 has illustrated that a group calling is layout, and it illustrates CD 302,304 and 306 and how to interact with one group of call server 308.For large-scale group, can adopt a plurality of groups of call servers as required.In Fig. 3, when licensed other member to group of CD 302 is while sending media, CD 302 is regarded as speaker, and can pass through set up channel and send media.When CD 302 is designated as speaker, remaining participant CD 304 and CD 306 may not send the license of media to group.Thereby CD 304 and CD 306 are designated as listener.As mentioned above, CD 302,304 and 306 is used at least one channel to link group call server 308.In one embodiment, channel comprises session initiation protocol (SIP) channel, media signaling channel and media traffic channel.

Fig. 4 has illustrated an embodiment of the group call server 102 being operated in Fig. 1 system.Group call server comprises the antenna 402,404 for transmitting and receive data.Antenna 402 is coupled to receiver circuit 406, and antenna 404 is coupled to radiating circuit 408.Communication bus 410 provides public connection at other intermodule of Fig. 4.Communication bus 410 is also coupled to memory cell 412.Memory 412 is the performed multiple operation of group call server and function preservation computer-readable instruction.The instruction of processor 414 execute store 412 interior preservations.

In group communication system, as shown in Figure 1, for example, organize in a large number participant and be conventionally gathered in little geographic area, for example construction site.In order to be positioned at all participants of single sector, to set up a plurality of point-to-point communication links be infeasible.The group participant meeting all available resources in this sector that " arch upward ".This can cause other user who does not belong to this group to stand very high calling prevention rate.In addition,, if group participant's density is very high in given sector, network may not have enough resources to each group participant assigned with dedicated channel.Therefore, user to be rejected that access group calls out be not owing to having group membership problem but owing to lacking available Internet resources.This problem has produced negative effect to group calling party.

According to an embodiment, media multicast mechanism has reduced network traffic, because the multiplexed mechanism of media has been eliminated each member of demand set up independent traffic channel between to(for) the group in group call server and target communication device.This mechanism has also been eliminated the medium replication that group call server needs for all members to target group send.In one embodiment, can to group address, send a copy of media, basic radio infrastructure can copy media in radio infrastructure jump place, the Path generation bifurcated in described jump place to different group memberships.Because group call server sends a copy of media, so media are replicated at network jumper connection place when needed, thereby have reduced significantly the network traffic on radio infrastructure RAN and service provider's WAN.

In one embodiment, the activation of application-layer media multicasting depends on that communication is man-to-man or (group) of one-to-many.In another embodiment, in group communication service, the participant's number in target group is depended in the activation of application-layer media multicasting.Fig. 5 has illustrated according to the call-setup process of the first embodiment wherein in one group, only have two participants, and for example, in man-to-man calling, or target group, participant's number is lower than activating the required predetermined threshold of application-layer media multicasting mechanism.

Wish to start group calling user can select one or more targeted customers, one or more predefined group or both combinations, and call (PTT) button that can push button start group calling.Caller start group calling time, the participant in target group can the grouping data conversation in dormancy in.The CD participating in sets up grouping data conversation 502 and carries out necessary registration, for example, described in above-mentioned patent application of awaiting the reply.Caller's CD can use set up grouping data conversation to group call server send one group of call request 504, with set up group calling.No matter whether caller's CD has special-purpose traffic channel, group call request can be sent to group call server, the U.S. Patent Application Serial Number 10/006 that this submitted on December 4th, 2002, in 037, describe, this application is transferred to assignee of the present invention and is incorporated into by reference this.

In one embodiment, caller's CD can send to group call server group call request on available channel, and need not wait for that the CD for caller sets up dedicated channel.In one embodiment, group call request can be used as (SDB) in Short Data Burst and is sent to group call server.After sending request, if caller's CD is in the grouping data conversation of dormancy, caller's CD just may start following process: rebuild dedicated traffic and be media activity preparation grouping data conversation.

When the call request of group call server reception group, if stipulated any predefined group in request, server will expand in target member list predefined group.Group call server can be target member retrieve location information, for example IP address.Group call server also can determine whether the group of expectation is moved in system.

Group call server uses set up grouping data conversation to confirm that with one group of call request 506 respond.In one embodiment, group call server determines in 508 whether the participant's number in target group meets the required threshold value of activation application layer multicast mechanism.If the participant's number in target group does not meet required threshold value, group call server just can call bright 510 to caller CD and to listener CD transmission group calling on set up grouping data conversation.

Group calling is called bright 510 and can be comprised and show to organize the information that call server can be used unicast mechanism, wherein organize call service can use set up grouping data conversation with media delivery to group membership.This requires group calling in a copy of server replicates media and sends it to each independent group membership, but is saving time for calling out one to one or having aspect a small amount of participant's group call setup multicast tree.Group call server can be searched media 512 by the CD from caller on set up grouping data conversation, and the media that receive 514 is forwarded to listener's CD.

Fig. 6 has illustrated according to the call establishment of an embodiment, wherein organizes outnumbering of participant and activates the required predetermined threshold of application-layer media multicasting mechanism.As discussed in conjunction with Fig. 5, after setting up grouping data conversation 602, caller's CD can to group call server send one group of call request 604 with set up group calling.When the call request 604 of group call server reception group, group call server can confirm that 606 respond with one group of call request.

In one embodiment, group call server can send with set up grouping data conversation this response.Group call server can be at 608 participant's numbers of determining in target group.If the participant's number in target group exceeds required threshold value, group call server is sent to the CD of target listeners with regard to the media that use IP media multicast mechanism that it is received from caller CD.Group call server can be called bright 610 group calling and be sent to caller CD and listener CD on set up grouping data conversation.The group calling that is sent to group participant from group call server is called bright 610 and can be comprised and show to organize the information that call server can be preserved Internet resources by IP media multicast mechanism.

Group calling cry shows that target group membership can need and the information of asked group calling binding bright also can comprising.This information can comprise ip multicast address and/or some multicast service identifier.In one embodiment, group call server can be inquired about another networking component and obtain the ip multicast address that target group call will be used.In one embodiment, group call server can be assigned to ip multicast address base for group communication.When group end of calling, ip multicast address can be returned in storehouse.

After reception group calling cry is bright, the CD of each participation can carry out registration process 612 to radio infrastructure.Registration process 612 can be carried out on dedicated channel or common signal channel, and described dedicated channel is for example Reverse Enhanced Access Channel (R-EACH) or Reverse Access Channel (R-ACH) of Reverse Fundamental Channel (R-FCH), described common signal channel for example.Registration message can be notified BSC: the CD participating in wish to participate in group calling.Registration message also comprises sign, and each participates in community that CD is positioned at and/or the information of sector.Registration message also can comprise ip multicast address, multicast service identifier and participate in other network parameter that CD may receive from group call server.

BSC can bind the IP-multicast address of the multicast of registered participation CD and target group in 614.In one embodiment, BSC registers each by independent dedicated channel participation CD and ip multicast address binding.This can occur in, and the participation CD counting of registering in Yi Ge community and/or sector is less than predetermined number or the participation CD that registers is sparsely arranged in the situation of more than Yi Ge community and/or sector.For example, if the CD of target listeners CD 104B or 104C as shown in Figure 1 arrange, corresponding BSC can be via dedicated channel these CD and ip multicast address binding.

In one embodiment, BSC is mapped to ip multicast address by shared channel registered participation CD.If this counting that can occur in the participation CD registering in Yi Ge community and/or sector is greater than predetermined number or the participation CD that registers is arranged in the situation of Yi Ge community and/or sector.For example, if the CD of target listeners CD 104A or 104D as shown in Figure 1 arrange, corresponding BSC can be mapped to ip multicast address these CD via shared channel.In one embodiment, if there is the channel of physical layer, BSC has shared forward channel ability, described physical layer channel is such as forward broadcast control channel (F-BCCH), Forward Common Control Channel (F-CCCH), Forward Paging Channel (F-PCH) or forward supplemental channel (F-SCH), for group calling is sent to one group of target listeners media.

Within a period of time, BSC can be broadcast to some wireless parameter 616 to participate in CD, or sends it to individually participation CD, usings as Overhead Message.BSC can separately be forwarded to each community or sector these parameters.Wireless parameter can comprise and shows that target CD is the information of ip multicast address that is tied to via dedicated channel or shared channel.In one embodiment, BSC can be at the upper wireless parameter that sends of forward broadcast control channel (F-BCCH), Forward Paging Channel (F-PCH) or Forward Common Control Channel (F-CCCH).Or BSC can directly send to wireless parameter and participate in CD on existing grouping data conversation.

In one embodiment, if BSC has shown BSC in wireless parameter, shared channel is mapped to the residing community of unregistered participation CD and/or sector, has received wireless parameter but not yet to the participation CD of corresponding BSC registration, need not register to BSC.Yet, if having shown BSC in wireless parameter, BSC dedicated channel is mapped to the residing community of this unregistered CD and/or sector, unregistered participation CD must be to corresponding BSC registration.

Then, BSC can set up multicast path 618 between BSC and group call server, as awaited the reply below described in patent application: in the U.S. Patent Application Serial Number 10/011,526 that submit to November 5 calendar year 2001, it is transferred to assignee of the present invention and is incorporated into this completely by reference.

Receiving, group calling cry is bright and successfully after BSC registration, caller's CD can send to group call server media 620 in reverse dedicated channel, and described reverse dedicated channel is reverse supplemental (R-SCH), Reverse Dedicated Control Channel (R-DCCH) or Reverse Fundamental Channel (R-FCH) for example.Or caller's CD can be used reverse common channel to communicate by letter with BSC, described reverse common channel is Reverse Enhanced Access Channel (R-EACH) or Reverse Access Channel (R-ACH) for example.Existing grouping data conversation can be placed in to park mode in either case.The media 622 that BSC can be used set up grouping data conversation or multicast path that BSC has been received from caller CD send to group call server.

Group call server can be used ip multicast address, and a copy media is multicasted to relevant BSC on set up ip multicast path 624.Media advance along multicast path 624 and arrive those BSC that set up multicast path for same ip multicast address.In one embodiment, BSC may need the media that it is received from group call server to copy to send to the CD of target listeners.This occurs the in the situation that of can be mapped to target CD via dedicated traffic in ip multicast address, such as in the situation that CD 104B or the 104C described in Fig. 1.

BSC can send to the CD that is mapped to each target listeners of ip multicast address via a dedicated channel in this set up dedicated channel a copy 626 of media.BSC also can send to the CD that is mapped to the target listeners of ip multicast address via shared channel a copy 626 of media.

In one embodiment, no matter group calling is how many middle participant's number, and BSC can be established as shared forward channel forward traffic channel.In the message to participation CD, BSC can show that BSC is broadcast to wireless parameter to participate in CD.Receipt message but the participation CD that not yet carries out registration need not register again.In order to receive group calling media, this CD can be tuned to the wireless parameter stipulated in message, this advantageously prevents spreading unchecked of the registration message that sends in common reverse link, has therefore reduced the number of the handled unnecessary registration message of BSC.

In one embodiment, if BSC from a given community or the number of registration messages that receives of sector exceed a given threshold value, BSC can be established as shared forward channel forward traffic channel.If the number of registration messages that BSCCong mono-community or sector receive is lower than described threshold value, BSC can send to each media and participate in CD in dedicated channel.BSC can participate in CD to each or some and initiate a message, and represents BSC or uses shared channel or use dedicated forward channel.

In one embodiment, group communication system 100 is for group calling is service support chat-room model and ad hoc (ad-hoc) pattern.In chat-room model, group is predefined, and they can be stored in group calling on Distributor.Predefined group or net can be public, mean that group has open member's list, and any CD may add group.In this case, each group membership's dispatch user be a group calling in potential participant.In chat-room model, group calling the first group membership, select to start to add group calling time start.In a predetermined amount of time, outstanding argumentation words activity is how, calls out and all keeps moving, and server resource is assigned to calling, described predetermined time section can be configured by service provider.A group calling during, the special request of group membership adds and/or leaves this class and call out.Speaking between craticular stage, each group calling, being brought into group dormant state, can be discussed below, until the license that group membership's request is spoken.When being operated in chat-room model lower time, a group communication equipment user, also referred to as net member, uses the communication equipment that is assigned to each net member to communicate with one another.Term " net " represents an authorized group communication equipment user of communication to each other.

Yet in the ad-hoc model of group call service, group can be defined in real time, and has member's list of organizing relevant closed to each.Member's list meeting regulation of closed allow which member participate in group calling.Member's list is unavailable for other user outside member's list of closed, and only within the calling survival phase, exists.Ad-hoc group definitions may not be stored in group call server.Described definition can be used for setting up group calling and after end of calling, discharge this calling.Ad-hoc group can form when the speaker that starts selects one or more target members the call request of generation group, and described group of call request is sent to group call server to start this calling.Group call server can send them to target group membership and be included in the notice in group.Group call server target member can be joined automatically group calling in, do not need any user action of target member.

When ad-hoc call becomes inertia, (tear down) this calling " is unloaded " in group communication server meeting, and discharges the resource that is assigned to group, comprises for starting the group definition of this calling.In one embodiment, after date when one section of inertia, BSC can discharge traffic channel, for example, share and/or special-purpose traffic channel, but still maintenance multicast path is movable.Yet, after date when the inertia of an elongated segment, BSC and/or wireless network infrastructure can trigger a multicast group and leave, and such as Internet Group Management Protocol (IGMP), thereby unload multicast tree.This can stop the RAN of wireless network infrastructure and/or service provider's WAN with those because group call session that network or group calling finish server failure keeps being connected.

Therefore, the disclosed embodiments significantly reduce network traffic and media processing time by sending media with ip multicast pattern, wherein by wall scroll multicast path, to radio infrastructure, send the single copy of the media that point to one group of intended recipient.A copy of the media that wireless infrastructure replicates receives also sends it to each intended recipient that is assigned to a dedicated channel.Yet radio infrastructure only sends a copy of the media that receive to those intended recipient that are assigned to shared channel.

Those skilled in the art will appreciate that information and signal can represent with any in multiple different technologies and technique.Data, instruction, order, information, signal, bit, code element and the chip that for example, may relate in above-mentioned explanation can represent with voltage, electric current, electromagnetic wave, magnetic field or its particle, light field or its particle or their combination in any.

Those skilled in the art can further understand, and can be used as electronic hardware, computer software or both combinations realize in conjunction with the described various illustrative logical blocks of embodiment disclosed herein, module and algorithm steps.In order to clearly demonstrate the interchangeability between hardware and software, as various illustrative assemblies, block diagram, module, circuit and step 1 according to its functional elaboration.These are functional realizes as hardware or software the specific application & design constraint of depending on that whole system adopts actually.Technical staff may be to realize described function for the different mode of each application-specific, but this realization determines should not be interpreted as causing to deviate from scope of the present invention.

The realization of various illustrative logical block, module and the algorithm steps of describing in conjunction with embodiment as described herein or execution can be used: general processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or the combination in any designing for carrying out function described here.General processor may be microprocessor, yet or, processor can be processor, controller, microcontroller or the state machine of any routine.Processor also may be realized with the combination of computing equipment, as, the combination of DSP and microprocessor, multi-microprocessor, in conjunction with one or more microprocessors of DSP kernel or other this configuration arbitrarily.

In conjunction with the method for disclosed embodiment description here or the step of algorithm, may directly be included in the software module of carrying out in hardware, by processor or in the middle of both.Software module may reside in the medium of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, removable dish, CD-ROM or any other form as known in the art.The coupling of exemplary memory media and processor, makes the processor can be from read information, or information is write to medium.Or medium can be integrated with processor.Processor and medium may reside in ASIC.ASIC may reside in user terminal.Or processor and medium may reside in user terminal as discrete component.

The description of above preferred embodiment makes those skilled in the art can manufacture or use the present invention.The various modifications of these embodiment are apparent for a person skilled in the art, and the General Principle of definition can be applied in other embodiment and do not use creativity here.Therefore, the present invention is not limited to shown here embodiment, and will meet the most wide in range scope consistent with the principle disclosing and novel feature here.

Claims (3)

1. for determining whether, will share a method that multicasts media to one group of target communication device on path, described method comprises:
From one group of call request, determine one group of target communication device;
Determine participant's counting in described this group target communication device;
If described counting exceeds a predetermined threshold, on shared channel, a copy of described media is multicasted to described this group target communication device; And
If described counting, lower than described predetermined threshold, sends to a copy of described media each member of described this group target communication device in dedicated channel.
2. for determining whether, will share a device that multicasts media to one group of target communication device on path, described device comprises:
For determine the device of one group of target communication device from one group of call request;
For determining the device of described this group target communication device participant counting;
If exceed a predetermined threshold for described counting, a copy of described media is multicasted to the device of described this group target communication device on shared channel; And
If lower than described predetermined threshold, a copy of described media is sent to each member's of described this group target communication device device for described counting in dedicated channel.
3. for determining whether, on multicast path, multicast media to a device for one group of target communication device, comprise:
Memory cell;
Receiver;
Transmitter; And
Be coupled to the processor of memory cell, Receiver And Transmitter, described processor can:
From one group of call request, determine one group of target communication device;
Determine the participant's counting in described this group target communication device;
If described counting exceeds a predetermined threshold, on shared channel, a copy of described media is multicasted to described this group target communication device; And
If described counting, lower than described predetermined threshold, sends to a copy of described media each member of described this group target communication device in dedicated channel.
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